As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS FOR DOOR L4 & AREA LIGHTS SEAT ROW 42 TO 50 LT SIDE, DID NOT ILLUMINATE DURING EMERGENCY LIGHT TEST. FOUND BATTERY PACK FOR EMERGENCY POWER SUPPLY M33407 ON OVER DOOR PANEL L4 DEGRADED. REPLACED THE BATTERY PACK. OP CHECKED GOOD IAW AMM 33-51-06-960-802.